Method of and apparatus for forming patches



Dec. 26, 1933. w. P. PETERSON METHOD OF AND APPARATUS FOR FORMING PATCHES Filed July 7, 1930- INVENTOR. M/fie/PH /e/Jon A TTORNEY.

Patented Dec. 26, 1933 were ST TES 1,941,019 METHOD OF AND APPARATUS FOR PATENT-ToFFIcE I FORMING PATCHES Wilber RPeterson, Kansas City, M0., assignor 1 of one-half to Snyder and Gray Incorporated, Kansas City, Mo., a corporation of Missouri Application July 7, 1930. Serial No. 465,992

' 4 Claims. 1 (01. 164-29) 7 My invention relates to a method of formin tire patches or the like and apparatus-for carrying out the method, having reference more paror punching tool will confer a thin edge on a patch, whereby production of beveled edge patches may be facilitated, and patchesha ving' thin edges may be producedcheaply and rapidly.

In accomplishing these and other objects of my invention, I 'haveprovided improved details of 0 structure, the preferredforms of which are illustrated in the accompanying .drawing, wherein: Fig. 1 is a sideelevation partly in section of apparatus adapted for carrying out my improved method .of producing patches, a motor for. actuating the apparatus being shown fragmentarily. Fig. 2 is a front elevation ofthe device partly in section. 9 V Fig. 3 is an enlarged detail perspective view of a punch and a ram shown fragmentarily.

Fig. 4 is a fragmentary section through the die and punch in material distorting position for ap v I I a to the margin ofthe blank defined byfthe edges plying the cut. v Fig. 5 is a perspective view of a patch formed y m i v d-m th 7 Referring in detail to the drawing; ,3 9 I 1 designates a base orbed plate adapted to support a die 2 presently described, and 3 a frame mounted on the base at one side thereof and integral therewith, having a bearing 4. at its upper end for supporting a shaft 5 having a pulley 6 provided with a V-shaped peripheral groove. A belt '7 shaped to engage in said pulley groovemoves on a similar pulley 8 driven by a motor 9 for rotating the shaft. A crank 10 on the shaft has a crank pin 11 on which is mounted a link 12 pivotally connected with a plunger or ram 13 reciprocating in a guide l4 projecting from the frame and adapted to support a punch 15 having a peripheral cutting edge 16 enclosing an area corresponding approximately to the size of a blank to be produced by the apparatus and defining the pattern of the blank;

The die 2 is fixed to the base below the punch, and has an orifice 1'7 forming a peripheral knife edge affording slight clearance for the edge of the punch whereby the punch may cuta blank from a" sheet of material mounted on the face 'ofthedie v 1 'In order to confer thin and preferablyv beveled edges on the blank as the same is cut out by the punch, I provide aboss-like face member or pad 18' on-the end face of the punch havingsides spaced inwardly from the cutting edge 16 thereof and preferably having beveled or rounded edges -19. to avoid damage to the patch. Themiddle portionof that area of the sheet which is to be cut out to form a blank'will be depressed by the pad into the orifice'of the 'die in advance of the punch edge and be retained therein while the edge of the punch facts cooperatively with the die 0. to sever the blank from the sheet.

The pad preferably consists of a separate plate conforming in contour to thefpattern of the punch edgeand die orifice,-.havin'g openings 20 to receive studs 21 formed onthe punch face and an axial 75. opening 22 for admitting. a retaining screw 23 or the like into the punclrfor securing the pad to the punch. l i

The pad as illustrated in Fig. 4'produces-afullness orpuckeringeffect in the area .of material. 0 Y pressed into the die opening, wherein the middle portion 24 of said area engaged by the padand "depressed thereby is conne'cted'to the surrounding material located on the-die face by an annular or marginal. strip or border 25.'.' The border strip 85.

inclines upwardly outwardly, from said portion 24.

of the punch and die, and'isthus retainedin angular position ;relativejto the supported material and the cutting edges and freefrom contact with the padjwhilethe punch' o'perates. a The punchjedge thus passes angularly through the material, to effect a bias cut, and severs all portions of the blank edge simultaneously, to produce the beveled edge on the blank as shown in 9 Fig. 5. 4 In forming tire patches, a sheet may be employed having a body formed of resilient or flexible material such as rubber, and having a relatively inelastic fabric or like facing such as linen 26 on one side to protect an adhesive face of the body. 7 Such a sheet is fed to the machine with the uncovered face of the body-on the die. The pad will then bear on the facing to depress the blank forming area, drawing portions of the body and facing from the area thereof surrounding the orifice, and distorting and moving said portions into the orifice to add to the area defined bythe face of v the pad. The added portions comprise edges of the blank-forming area located at an angle to 1 from the edges of the punch and have suitable thickness to depress a portion of the sheet of material sufficiently to effect formation'of desired type of thin edge on the patch. The material may be fed by any suitable means along the die beneath the punch, at a rate corresponding to the rate of reciprocation of the ram.

, Formation of beveled patches by a singlestampingtopera'tionin' apparatus as described, permits rapid production of finished patches, and "as many as 350 patches per minute may be proe, duced, contrasting with the slow production of patches which require movement of a knife around the periphery .of'a blank to form the beveled edge; v 7

Ability to produce patches of any desired shape a and provided with bevelededges thus promotes economy in the use and production of patches, since patchesmay be supplied to exactly suit a particular situation, for example, a particular type of wound in a'tire or tube, and the shape of die edges need not be arranged circularly or according to any'arbitrary design merely to facilitate skiving by supplemental means. Straight sided patches are further possible with the use of my method and apparatus, whereby maximum r economy in use of the material in a sheet is afforded, thus avoiding the wasteful practice of cutting arcuate edge patches from a'sheet.

'What'I claim and desireto secure by Letters Patent is: Y

1. An apparatus for forming patches of resilient materialhaving a relatively non-elastic facingy'including a die member having 'cuttingedges arranged to form the required shape of the-patch,

a punch member having; cutting edges cooperating with said cutting edges on the die member,

and a pad member fixed to the lower face of the punchmember and'arrangedto displace the central portion ofthe material forming the patch prior .to engagement of the cutting edges 'for i drawing the patch material" at an angle across the cutting edges and saidpad member having its peripheral'side edges spaced. inwardly relatively to said cutting edges to provide an annular recess about the pad'wherein the material adjacent the cutting edges puckers without loosening the non-elastic facing from the resilient material of the patch during the cutting operation.

2. An" apparatus for forming patches of resilientmaterial having a relatively non-elastic facing including a die member provided with an opening similar in shape to the patch to be formed and having cutting edges surrounding said opening, a punch member projectable through said opening and having cutting edges cooperating with said cutting edges on the die member, and a pad member on the. lower face of the punch 'member and having a peripheral bevelled edge spaced downwardly and inwardly from the cutting edges of the punch member to displace the central portion of the patch for drawing the patch material across the cutting edges at an angle substantially equal to the angle of said bevelled-edge-and forming an annular recess about the pad wherein the material adjacent the cutting edges puckers without loosening thenonelastic facing from the resilient material forming the-patch during the cutting operation.

3. An apparatusfor forming patches of resilient material having a relatively non-elastic facing including a die having cutting edges, a punch member having cutting edges cooperating with the edges of said die member, and a pad member on the punch member for displacing the central portion of the patch to draw the patch material at an angle across thecutting edges and having its peripheral side edges spaced inwardly from the cutting edges of the punch'member a distance greater than'the thickness of said patchforming material to provide aperipheral recess wherein the material adjacent the cutting edges puckers and adjusts itself upon cutting opera tion of said die and punch members to prevent loosening of the facing from the resilient material.

4. The method of forming patches from a sheet of resilient material having a relatively non elastic facing-comprising applying pressure to the centralportionof a patch-forming area of the sheet to displace said area from the plane of the sheet, confining the pressure only to the central portion of said area whereby the marginal portion of the area is free from pressure and resulting in the marginal portion puckering upwardly adjacent the pressure area thus preventing loosening of the facing from the resilient material, and

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cutting the sheet at the periphery of said marginal portion. WILBER' P. PETERSON its 

